Parabolic-trough solar collectors are widely used in solar thermal power-generation stations because the structure is simple and inexpensive. However, many factors affect their performance. Here, we derive an optical-thermal-structure numerical method. The heat flux is unevenly distributed along the circumferential direction of the absorber tube, resulting in uneven temperature distribution. An area of stress concentration is apparent at a rim angle of about 75°, and the maximum von Mises stress is approximately 100 MPa, near the fixed end of the tube. As the geometric concentration ratio increases, the position of maximum heat flux gradually moves to the bottom of the tube. An increase in this value increases the heat transfer fluid temperature, and the stress on the tube rises as the temperature distribution becomes more inhomogeneous. As the rim angle increases, the position of maximum heat flux gradually shifts to the sides of the tube. The stress on the tube then decreases because the temperature distribution becomes more uniform. The performance of a parabolic-trough solar collector can be improved by changing the geometric concentration ratio and rim angle, taking care to ensure no material failure. Optical, heat transfer, and thermal stress analyses of a parabolic-trough solar collector were systematically performed. This study provides guidance for practical engineering applications of parabolic-trough solar collectors.

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抛物槽式太阳能集热器的光学、热学和结构性能分析

抛物槽式太阳能集热器因其结构简单、成本低廉而广泛应用于太阳能热发电站。但是，许多因素会影响它们的性能。在这里，我们推导出一种光热结构数值方法。热通量沿吸收管圆周方向分布不均，导致温度分布不均。在大约 75° 的边缘角处，应力集中区域很明显，并且在管子的固定端附近，最大的 von Mises 应力大约为 100 MPa。随着几何浓度比的增加，最大热通量的位置逐渐向管底移动。该值的增加会增加传热流体的温度，并且随着温度分布变得更加不均匀，管子上的应力也会增加。随着轮缘角度的增加，最大热通量的位置逐渐向管子的两侧移动。由于温度分布变得更加均匀，管子上的应力随之降低。抛物槽式太阳能集热器的性能可以通过改变几何聚光比和边缘角来提高，注意确保没有材料失效。系统地进行了抛物槽式太阳能集热器的光学、传热和热应力分析。本研究为抛物槽式太阳能集热器的实际工程应用提供指导。抛物槽式太阳能集热器的性能可以通过改变几何聚光比和边缘角来提高，注意确保没有材料失效。系统地进行了抛物槽式太阳能集热器的光学、传热和热应力分析。本研究为抛物槽式太阳能集热器的实际工程应用提供指导。抛物槽式太阳能集热器的性能可以通过改变几何聚光比和边缘角来提高，注意确保没有材料失效。系统地进行了抛物槽式太阳能集热器的光学、传热和热应力分析。本研究为抛物槽式太阳能集热器的实际工程应用提供指导。